AP VCF 115 V1d
3
Assembly Instructions
The All Pass VCF module has no particular requirements not already covered in the ‘General
Guidance on a M²Synth Module Assembly’ booklet included with this kit.
Calibration
1.
Power up module and allow to ‘warm up’ for 10 minutes
2.
Connect a 440Hz sine wave @ 10V Pk-Pk to Signal input 1. Resonance to 0%, Signal 1
Level to 100% & cut-off to 100%
3.
Adjust Pr1 until output is 10V Pk-Pk using an oscilloscope.
4.
Remove input signal.
5.
Apply a CV of 0V to the COF CV In input. Increase resonance control until self-
oscillation occurs at approx. 10V Pk-Pk
6.
Adjust cut-off until output is at 100Hz.
7.
Apply a CV of 4V to the COF CV In input
8.
Use Pr2 to calibrate at 1.6kHz (see note below)
9.
Repeat from step 5 until 4V gives 1.6kHz
Note: If the frequency is flat (<1.6kHz), use Pr2 and make the frequency lower (flatter), if
above target frequency, use the trimmer to make the frequency even higher, this can be
counter-intuitive. You will soon get the feel of how much to increase or decrease the
frequency by.
Specification
Supply v/-12Vdc
Supply c13mA / -16mA
Waveform /-5V
Frequency range: 20Hz to 15kHz without any CV applied
Main PCB dimensions 43.5x130mm
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